===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.15.0-rc1-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.4/16493 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff88807d9d63b8 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x300 fs/fcntl.c:796 and this task is already holding: ffff88808c73c0c0 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline] ffff88808c73c0c0 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x13b/0x430 fs/fcntl.c:1035 which would create a new lock dependency: (&new->fa_lock){....}-{2:2} -> (&f->f_owner.lock){...-}-{2:2} but this new dependency connects a SOFTIRQ-irq-safe lock: (&timer->lock){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x71a/0x910 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 on_stack arch/x86/include/asm/stacktrace.h:48 [inline] stack_access_ok arch/x86/kernel/unwind_orc.c:342 [inline] deref_stack_reg arch/x86/kernel/unwind_orc.c:352 [inline] unwind_next_frame+0x1261/0x1fa0 arch/x86/kernel/unwind_orc.c:587 arch_stack_walk+0x112/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3219 __d_alloc+0x2a/0x700 fs/dcache.c:1744 d_alloc fs/dcache.c:1823 [inline] d_alloc_parallel+0xd3/0x1520 fs/dcache.c:2575 __lookup_slow+0x110/0x3d0 fs/namei.c:1642 lookup_one_len+0x186/0x2c0 fs/namei.c:2686 start_creating+0x184/0x330 fs/debugfs/inode.c:352 debugfs_create_dir+0x24/0x530 fs/debugfs/inode.c:557 bdi_debug_register mm/backing-dev.c:110 [inline] bdi_register_va+0x247/0x530 mm/backing-dev.c:890 super_setup_bdi_name+0xe0/0x1c0 fs/super.c:1557 fuse_bdi_init fs/fuse/inode.c:1247 [inline] fuse_fill_super_common+0x6c1/0x1160 fs/fuse/inode.c:1510 fuse_fill_super+0x28e/0x350 fs/fuse/inode.c:1605 vfs_get_super fs/super.c:1140 [inline] get_tree_nodev+0xaf/0x160 fs/super.c:1170 fuse_get_tree+0x203/0x310 fs/fuse/inode.c:1669 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x308/0x3c0 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1504 kernel_wait+0xe4/0x230 kernel/exit.c:1694 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 other info that might help us debug this: Chain exists of: &timer->lock --> &new->fa_lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&timer->lock); lock(&new->fa_lock); lock(&timer->lock); *** DEADLOCK *** 4 locks held by syz-executor.4/16493: #0: ffff888077b01568 (&tu->ioctl_lock){+.+.}-{3:3}, at: snd_timer_user_ioctl+0x4d/0x80 sound/core/timer.c:2128 #1: ffff888020c9f948 (&timer->lock){..-.}-{2:2}, at: snd_timer_start1+0x5b/0x640 sound/core/timer.c:541 #2: ffffffff8c91c180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 #3: ffff88808c73c0c0 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline] #3: ffff88808c73c0c0 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x13b/0x430 fs/fcntl.c:1035 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&timer->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x71a/0x910 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 on_stack arch/x86/include/asm/stacktrace.h:48 [inline] stack_access_ok arch/x86/kernel/unwind_orc.c:342 [inline] deref_stack_reg arch/x86/kernel/unwind_orc.c:352 [inline] unwind_next_frame+0x1261/0x1fa0 arch/x86/kernel/unwind_orc.c:587 arch_stack_walk+0x112/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3219 __d_alloc+0x2a/0x700 fs/dcache.c:1744 d_alloc fs/dcache.c:1823 [inline] d_alloc_parallel+0xd3/0x1520 fs/dcache.c:2575 __lookup_slow+0x110/0x3d0 fs/namei.c:1642 lookup_one_len+0x186/0x2c0 fs/namei.c:2686 start_creating+0x184/0x330 fs/debugfs/inode.c:352 debugfs_create_dir+0x24/0x530 fs/debugfs/inode.c:557 bdi_debug_register mm/backing-dev.c:110 [inline] bdi_register_va+0x247/0x530 mm/backing-dev.c:890 super_setup_bdi_name+0xe0/0x1c0 fs/super.c:1557 fuse_bdi_init fs/fuse/inode.c:1247 [inline] fuse_fill_super_common+0x6c1/0x1160 fs/fuse/inode.c:1510 fuse_fill_super+0x28e/0x350 fs/fuse/inode.c:1605 vfs_get_super fs/super.c:1140 [inline] get_tree_nodev+0xaf/0x160 fs/super.c:1170 fuse_get_tree+0x203/0x310 fs/fuse/inode.c:1669 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x308/0x3c0 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1087 snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline] snd_pcm_post_stop sound/core/pcm_native.c:1453 [inline] snd_pcm_action_single sound/core/pcm_native.c:1229 [inline] snd_pcm_action sound/core/pcm_native.c:1310 [inline] snd_pcm_stop+0x3b8/0x4c0 sound/core/pcm_native.c:1476 snd_pcm_drop+0x16d/0x290 sound/core/pcm_native.c:2155 snd_pcm_oss_sync+0x4f4/0xee0 sound/core/oss/pcm_oss.c:1721 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2571 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x6fc/0x2580 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16e0/0x20c0 kernel/signal.c:2868 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:302 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] snd_timer_new.__key+0x0/0x40 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:891 __fput+0x720/0x870 fs/file_table.c:277 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:302 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1014 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:697 [inline] snd_timer_user_start sound/core/timer.c:1985 [inline] __snd_timer_user_ioctl+0xe8b/0x60a0 sound/core/timer.c:2108 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] fasync_insert_entry.__key+0x0/0x40 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1014 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:697 [inline] snd_timer_user_start sound/core/timer.c:1985 [inline] __snd_timer_user_ioctl+0xe8b/0x60a0 sound/core/timer.c:2108 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1504 kernel_wait+0xe4/0x230 kernel/exit.c:1694 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 SOFTIRQ-ON-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1504 kernel_wait+0xe4/0x230 kernel/exit.c:1694 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 copy_process+0x34b4/0x5c80 kernel/fork.c:2313 kernel_clone+0x230/0x7d0 kernel/fork.c:2584 kernel_thread+0x155/0x1d0 kernel/fork.c:2636 rest_init+0x21/0x2e0 init/main.c:698 start_kernel+0x4bf/0x56e init/main.c:1141 secondary_startup_64_no_verify+0xb1/0xbb INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1504 kernel_wait+0xe4/0x230 kernel/exit.c:1694 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xbe/0x300 fs/fcntl.c:810 dnotify_handle_event+0x136/0x450 fs/notify/dnotify/dnotify.c:97 fsnotify+0x9e5/0x12e0 fs/notify/fsnotify.c:541 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_dirent include/linux/fsnotify.h:42 [inline] fsnotify_mkdir include/linux/fsnotify.h:235 [inline] vfs_mkdir+0x5a0/0x6c0 fs/namei.c:3887 do_mkdirat+0x277/0x530 fs/namei.c:3911 __do_sys_mkdir fs/namei.c:3931 [inline] __se_sys_mkdir fs/namei.c:3929 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:3929 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x360 fs/fcntl.c:835 sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3072 tcp_check_urg net/ipv4/tcp_input.c:5550 [inline] tcp_urg+0x2b6/0xb40 net/ipv4/tcp_input.c:5591 tcp_rcv_established+0x9ec/0x22b0 net/ipv4/tcp_input.c:5925 tcp_v4_do_rcv+0x3a1/0x880 net/ipv4/tcp_ipv4.c:1694 tcp_v4_rcv+0x3aa1/0x4880 net/ipv4/tcp_ipv4.c:2087 ip_protocol_deliver_rcu+0x1ed/0x3b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x316/0x490 net/ipv4/ip_input.c:252 __netif_receive_skb_one_core net/core/dev.c:5436 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5550 process_backlog+0x518/0x9a0 net/core/dev.c:6427 __napi_poll+0xba/0x4f0 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x61c/0xf30 net/core/dev.c:7136 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:920 smpboot_thread_fn+0x533/0x9d0 kernel/smpboot.c:164 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316 f_modown+0x38/0x340 fs/fcntl.c:91 __f_setown fs/fcntl.c:110 [inline] f_setown_ex fs/fcntl.c:200 [inline] do_fcntl+0x11fe/0x1560 fs/fcntl.c:399 __do_sys_fcntl fs/fcntl.c:472 [inline] __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:457 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x360 fs/fcntl.c:835 sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3072 tcp_check_urg net/ipv4/tcp_input.c:5550 [inline] tcp_urg+0x2b6/0xb40 net/ipv4/tcp_input.c:5591 tcp_rcv_established+0x9ec/0x22b0 net/ipv4/tcp_input.c:5925 tcp_v4_do_rcv+0x3a1/0x880 net/ipv4/tcp_ipv4.c:1694 sk_backlog_rcv include/net/sock.h:1024 [inline] __release_sock+0x1d8/0x4c0 net/core/sock.c:2668 release_sock+0x5d/0x1c0 net/core/sock.c:3200 sk_stream_wait_memory+0x6f9/0xdc0 net/core/stream.c:145 tcp_sendmsg_locked+0x16e5/0x4120 net/ipv4/tcp.c:1421 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1461 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] __sys_sendto+0x56c/0x730 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2044 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:796 kill_fasync_rcu fs/fcntl.c:1021 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:697 [inline] snd_timer_user_start sound/core/timer.c:1985 [inline] __snd_timer_user_ioctl+0xe8b/0x60a0 sound/core/timer.c:2108 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae stack backtrace: CPU: 0 PID: 16493 Comm: syz-executor.4 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2565 [inline] check_irq_usage kernel/locking/lockdep.c:2804 [inline] check_prev_add kernel/locking/lockdep.c:3055 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain+0x6f4c/0x8240 kernel/locking/lockdep.c:3789 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5015 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:796 kill_fasync_rcu fs/fcntl.c:1021 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1035 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:697 [inline] snd_timer_user_start sound/core/timer.c:1985 [inline] __snd_timer_user_ioctl+0xe8b/0x60a0 sound/core/timer.c:2108 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fac61640188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe72c7fc4f R14: 00007fac61640300 R15: 0000000000022000